In the human body, atp is produced by the breakdown of glucose. atp is the energy molecule of the cell. atp production yields about 36% of the potential energy available from glucose. what happens to the rest of the energy?

The rest of the energy is stored into sunlight and it is used to make ADP .

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.